Js compilation falsy values slides

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How does JS engine compete in performance space, how they compile, what are different compilation techniques and what will come in the future

Technology

JS compilation
hot or not?

Zbigniew Braniecki (gandalf@mozilla.com)

5 categories of benchmarks
• Real applications

5 categories of benchmarks
• Real applications
• Modiﬁed applications
(eg. with I/O removed to make it CPU-bound)

5 categories of benchmarks
• Real applications
• Modiﬁed applications
(eg. with I/O removed to make it CPU-bound)

• Kernels
(key fragments of real applications)

statistics

• How common is average?

• Biases (sampling, memory etc.)

statistics

• How common is average?

• Biases (sampling, memory etc.)

• Measuring the right thing is hard

statistics

• How common is average?

• Biases (sampling, memory etc.)

• Measuring the right thing is hard

• Reducing complexity

History

How did browser JS performance improve over time

V8

5000

3750

2500

1250

0
1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

SunSpider

20000

15000

10000

5000

0
1.0 1.5 2.0 3.0 3.5 3.6 4 Nightly-JS

SunSpider

3000

2250

1500

750

0
3.0 3.5 3.6 4.0 Nightly-JS

Kraken

50000

37500

25000

12500

0
3.0 3.5 3.6 4.0 Nightly-JS

method JIT
heap

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1
0
a b

method JIT
heap
hot loop!
10
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1
0
a b

tracing JIT
heap
a
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1
0
a

tracing JIT
heap
b
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1
0
a b

tracing JIT
heap
b
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1
0
hot trace! a b

How browsers compile stuff

• Chakra (IE) - method

• Carakan (Opera) - method

• Nitro (Safari) - method

• V8 (Chrome) - method

• JägerMonkey (Firefox) - trace + method

What to avoid

• competing heaps

• variable type changing

• evals

• looong methods

Future

• Dead code elimination

• Type Interface

• Function inlining

• CrankShaft (Chrome) and IonMonkey (Firefox)

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